The reproduction of Ochtodes secundiramea (montagne) howe (Gigartinales, Rhizophyllidaceae)

Abstract

This paper gives informations on the type of carpogonial branches found in a representative of the family Rhizophyllidaceae, as well as details of the auxiliary cell branches in the genus Ochtodes. Details of the development of the spermatangia in this genus are also presented. The tetrasporic plants, not yet known in this genus are described for the first time. The tetrasporangia are produced in nemathecia and have no sterile filaments in between, and in this respect are similar to the ones found in Rhizophyllis and Desmia the only other two genera of the family. Details of certain peculiarities of the vegetative thallus are also given. This is the first report of Ochtodes secundiramea in the American Western South Atlantic.

Ochtodes searlesii sp. nov. (Gigartinales, Rhodophyta), from the Pacific tropical coast of Mexico, based on morphological and molecular evidence

“…Agardh (1872), a genus belonging to the Rhizophyllidaceae, order Gigartinales (Schneider & Wynne 2007), currently comprises two species. The generitype, O. secundiramea (Montagne) M. Howe, has been long known from Caribbean México, Cuba, Barbados, Bahamas, the Lesser Antilles, including Guadeloupe and Martinique, and Brazil (Joly & Ugadim 1966, Mateo‐Cid & Mendoza‐González 1986, Littler & Littler 2000; Wynne 2005, Guiry & Guiry 2010), whereas the second species, O. crockeri Setchell et Gardner, is known only from the Galapagos Islands (Setchell & Gardner 1937).…”

“…This genus is well defined and includes thalli that are irregularly branched with cylindrical axes derived from two prominent apical cells. A transverse section of the thallus reveals a central medulla formed by two large axial filaments, an outer medullary region formed by large colorless cells, septate rhizoidal filaments and a cortex of smaller cells (Joly & Ugadim 1966). Distinct gland cells are present in the cortical layer.…”

“…Spermatangia and tetrasporangia are also formed in nemathecial sori. Tetrasporangia are regularly zonately divided in O. crockeri (Setchell & Gardner 1937) and obliquely zonate to nearly cruciately divided in O. secundiramea (Joly & Ugadim 1966).…”

Flora de macrófitas marinhas do arquipélago de Abrolhos e do recife Sebastião Gomes (BA)

“…Nas últimas décadas muitos foram os estudos taxonômicos que se concentraram em grupos específicos, buscando elucidar incertezas antigas de identificação de espécimes brasileiros em comparação com os descritos originalmente para o exterior. Muitos destes trabalhos incluem a costa baiana, tais como: Pinheiro-Joventino (1977) para Cryptonemia; Ugadim (1987) para Gelidium e Pterocladia; Ugadim (1993) Para a região do banco de Abrolhos também foram realizados trabalhos descritivos de uma só espécie: Joly e Ugadim (1966) para Ochtodes secundiramea, Yamaguishi-Tomita (1970) para Bolbocoleon jolyi da ilha Redonda (Abrolhos), Braga (1986) para duas espécies de Gigartina; Moura (1998) sobre Trichogloea requienii; Cassano e Yoneshigue-Valentin (2001) com Hincksia onslowensis e Moura e Guimaraes (2002) para Amphiroa vanbosseae.…”

“…Esporângios com 58-87 µm de diâmetro, distribuídos em ambas as faces do talo, não circundados por anel de células estéreis. Ocorrência prévia para a costa brasileira PE, BA e FN (Joly et al, 1966;Eston et al, 1986). -Recife Sebastião Gomes: primeira citação.…”